[euhlmann]

When you create projects through File > New > Wpilib > robot C++ project it should be adding the includes automatically. Check on the "paths and symbols" section if your project build settings, there should be a wpilib location listed under include paths. If there isn't, try setting up a new project with File > New > Wpilib > robot C++ project.

If the include path is listed but you still have errors, make sure you have correctly used the #include directive in your code. Also, you can try rebuilding your C++ index by right clicking your project > index > rebuild.